The def is where colm realy shines. A def is somewhere between a struct and a regular expression. Again one example is much more clearer.
assign.lm
lex start token id / ('a' .. 'z' | 'A' .. 'Z' ) + / token value / ( 'a' .. 'z' | 'A' .. 'Z' | '0' .. '9' )+ / literal `= `; ignore / [ \t\n] / end def assignment [ id `= value `;] def assignment_list [assignment assignment_list] | [assignment] | [] parse Simple: assignment_list[ stdin ] for I:assignment in Simple { print( I.id, "->", I.value, "\n" ) }
After the compilation we can pipe some input to it’s stdin.
/opt/colm/bin/colm assign.lm echo -e 'b=3;a=1;\n c=2;' |./assign
This gives us:
b->3 a->1 c->2
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this also illustrates how to read from stdin. |